Modulating device for sound-reproducers



G. S. PEASE. MOD'ULATING DEVICE FOR scum) REPRODUCERS.

APPLICATION FILED MAR; 9, 1920- Patented Aug. 23, 1921.

ATTORNEYS UNITED" STATES PATENT OFFICE;

GILBERT s. PEASE, or nroi-rrrnnn, Wisconsin.

-'- MODULATIIIG DEVICE FOR Sb'JND-REPRQDUCERS.

Application filed March 9,

T 0 oil whom it may concern:

Be 1t known that i, GILBERT S. PEASE, a

citizen of the United States, anc. a resident ranged to enable an operator to vary the vi bratory action of the diaphragm at will and with a view to render the sounds either softer or louder as desired. 7

Another object is to permit of conveniently attaching the modulating device to sound reproducers now generally con structed.

Another object is to provide a modulating device which is exceedingly simple in construction, cheap to manufacture and easy to apply to the sound box.

With these and other objects in view, the invention consists of certain novel features of construction as hereinafter shown and described and then specifically pointed out in the claims.

practical embodiment of the invention is represented in the accompanying draw ings forming a part of this specification, in which similar characters of reference indicate corresponding parts in both views.

Figure l is a face view of the improved modulating device as applied to a sound reproducer oi? the diaphragm type; and

Fig. 2 is a transverse section of the same on the line 22 of Fig. 1.

In the box 10 of usual construction is mounted diaphragm 11 connected at its center with the lever 12 carrying the stylus 13 adapted to engage the usual sound groove in a record li. The rear face of the diaphragm 11 is engaged by a modulating member 20 in the form of a piece of rubber tubing mounted on a wire 21 of segmental shape and terminating in a pivot 22 journaled in the back of the sound box 10, as plainly shown in the drawings. The outer end of the pivot 22 terminates in a handle 23 un- Specification of Letters Patent.

handle on the ou 1920. Serial No. 364,447.

der the control of the user of the phonograph to permit of swinging the modulatliatented Aug. 23, 1921;

ing member 20 nearer to or farther from the center of the diaphragm 11, By reference to ll ig. 2 it will be noticed that the modulating member 2:) is interposedbetween the i e oi the sound box 10 and the back of the diaphragm 1i, and this modulating member 2%) and its supporting wire are preferably made s e mental, as indicated in Fig. 1, so that when the modulating member is in its outermost position it is concentric with the' run of the sound box 10 and the peripheral.

edge oi the diaphragm 11.

(hi swinging the modulating member 20 nearer the center, as indicated in dotted lines inl ig. 1, the vibratory notion of the diaphragm 11 is reduced and consequently a softer tone is reproduced. it is understood'that by the arrangement described'the user can readily move the modulating member 26 into any desired intermediate position from the outermost norn al to an innermost position to modulate the reproduction of the sounds correspondingly.

w ving thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. in a sound reproducer. a sound'boz; provided wlth a diaphragm, segmental modu-- lating member interposed between the Sound boxand the rear taceoit the dia phragm and engaging the latter throughout its length, a pivot carrying the said member and iournalcd in the said sound box, and a or end of the said pivot to permit or moving the said modulating member nearer to or further trom the center oil the diaphragm.

In a sound RGPICOClHCQT, the combination with a sound box provided with 21 dia phragm, of a modulating device interposed between the sound box and the rear face of the diaphragm, said device consisting oi a segmental member engaging the diaphragm throughout its length, said member having an integral pivot by which it is mounted in the rear face of the sound box and from which extends an integral handle.

GILBERT s. PEASE. 

